A solid round bar shown in figure (1) below with diameter of D=2 in has a groove cut to a diameter of d=1.8 in, with a radius of r= 0.1 in. The bar is not rotating. The bar is loaded with a repeated bending that causes a bending load at the groove to fluctuate between 0 and 15000 lbf ·in. The bar is hot-rolled AISI 1050. Determine the factor of safety for fatigue based on Goodman criteria. (Choose only the approximate correct answer without attaching solution) M M Figure (1) A – 1.023 В - 0.735 C - 1.466 D- 2.542

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.